17/3-1
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General information
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Wellbore history
GeneralBlock 17/3 is situated approximately in the center of a broad, elongated Triassic rift basin composed of the Stord and Egersund basins. The well is located on a well-defined horst structure (Bark Prospect) in the northern part of the block, in an almost unexplored area in the southern part of the Stord Basin. Due to the "wildcat" nature of the well there were many unknowns and "worst case scenarios" had to be planned for. The well was designed for two objectives with different pressure regimes: The primary objective was the Late Jurassic Sandnes Formation at 1.20 sg. The Permian Rotliegendes Group at 1.55 sg was a secondary objective. This necessitated an expensive deep 13 3/8" casing (2312 m) to ensure that the 2 objectives could be properly evaluated and that the well could be completed in the 8 1/2" section. The expected hydrocarbon phase was oil. The prognosed TD of the well was 3300 m RKB, 309 m below the supposed Top Rotliegendes. This was in order to reach the highly dipping markers of assumed PaleozOperations and resultsWildcat well 17/3-1 was spudded with the semi-submersible installation "Wildcat Explorer" on 29 June 1995 and drilled to a total depth of 2852.15 m in metamorphic basement rock, dated 410 My. The well was drilled with seawater down to 949 m and with water based gypsum mud from 949 m to TD. The well came in under budget and almost 14 days ahead of schedule. A major contributing factor to the latter was the shallower than expected TD, 2852 m (basement) as opposed to 3300 m, due to the Permian section being non-existent. The primary objective Sandnes Formation was encountered at 2387 - 2409 m, about 50 m shallower than prognosed, with a hydrostatic pore pressure (1.05 sg emw from RFT and MDT) and only ~2 m of gas was found at the top of the reservoir. The Permian series were not present, as the Triassic Smith Bank Formation was directly deposited on metamorphic basement. The secondary objective, the Rotliegendes Group, was never encountered due to the missing Permian series. The well was permanently plugged and abandoned on 22 August 1995 as a gas discovery.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]955.002845.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12388.02390.0[m ]22391.02400.2[m ]32400.22417.9[m ]42849.02852.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]32.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2983968738739429661001103010301271138013801425150518751875198023112339238823882410244024402811 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.40 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf44.94 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AMS FMS GR23152849CST GR23242840DIL AMS MSF BHC GR23152846LDL AMS BHC GR9422310LDL CNL AMS NGT GR23152849MDT GR23882438MGR MEM DIR2982849RFT GR23892438VSP7302840 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeSURF.COND.30443.036445.00.00LOTCONDUCTOR20943.026949.00.00LOTINTERM.13 3/82312.017 1/22319.00.00LOTOPEN HOLE2852.012 1/42852.01.35LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3301.03WATER BASED4431.03WATER BASED4451.03WATER BASED4921.37WATER BASED5001.37WATER BASED6271.37WATER BASED8471.03WATER BASED9431.2619.0WATER BASED9491.03WATER BASED11331.3522.0WATER BASED12471.3523.0WATER BASED13151.3527.0WATER BASED15381.3527.0WATER BASED16951.3526.0WATER BASED17321.3524.0WATER BASED18361.3525.0WATER BASED19421.3527.0WATER BASED19761.3527.0WATER BASED20091.3524.0WATER BASED21111.3526.0WATER BASED21611.3527.0WATER BASED22331.3526.0WATER BASED23121.3525.0WATER BASED23181.3526.0WATER BASED23191.3528.0WATER BASED23901.3524.0WATER BASED24001.3521.0WATER BASED24271.3523.0WATER BASED24831.3532.0WATER BASED24941.3528.0WATER BASED25911.3524.0WATER BASED26331.3525.0WATER BASED26911.3525.0WATER BASED27441.3523.0WATER BASED28401.3528.0WATER BASED28461.3527.0WATER BASED28491.3524.0WATER BASED28501.3523.0WATER BASED28521.3523.0WATER BASED -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.22